Acetylene-blowpipe.



UNI TED STATES PATENT OFFICE.

JOHN HARRIS, )F CllllVlllANl), (ll l0, ASSllNOlt '1,0 THE lIARRlS CHAlRlFlC UOMPAN Y, UF (IIJICVIGMKS'D, (Hill), A CORPORATION U11" OHIO.

AoErYLVENE-uowerPlY-z.

Specification of Letters Patent.

Patented mg r4. 1907.

Apenas@ alla osera saires. anni Na 284,596.

To ull whom, t may concern.-

Be it lknown'that I, JOHN Hannie resdin at Cleveland, in the county of Cuya ogs. an State of Ohio, have invented a certain new and useful lm roveznent in Acetylene-Blowpipes, of whic the following is a full, clear and exact description, reference being had to the accompanying drawings.`

My invention relates to blow pipes, and particularly to such as are constructed to urn acetylene. The burning Yof this gas with a smokeless lame is very diiiicult of accomplishment. Owing to its richness in carbon, a relatively large proportion of air must be supplied thereto in order to avoid the production of a smoky llame, and the lia bilit to reduce such flame is 'enhanced by the act t t the gas is polymerized at a Ylow red heat. For these reasons and for the iurther reason that it is diiiicult to produce and maintain a satisfactory blow-pipe llame, even after a mixture of acetylene and air has been ignited, the'onl acetylene blow-pipes hitherto constructed Vave been designed Yfor use with oxy en, as distinguished vfrom air, and have not een satisfactorily operative if supplied with air instead ofoxygen. YB the construction of blow-pipe shown andr described herein, am enabled to vobtain re-Y sults hitherto obtainable only in blow-pipes which use oxygen with acetylene.

In the drawings, F'gure gitudinal sectional view through -a biot?Y pipe constructed in accordance with my inven-Y tion; Fig. 2 represents a cross-sectional view taken on the line 2-2 of Fig. 1;' and Fi 3 represents a sectional detail of a modiieatien.V

of the discharge nozzle of the blow pipe shown in Fig. 1.

Describing the parte by reference numerals, 1 re resents a blow pipe, consisting of a tubular dv having an enlarged rear portion 2 and a smaller or contracted iront portion 3. The enlarged roar portion is provided with a corresponting enlarged 'bore or chamber 4 v and the contracted portion is provided with a bore 5. The discharge end of the reduced portion 3 is provided with an enlarged chamer 6. This chamber may be provided within a separate hood 7 attached tothe end of the portion 3 as shown in Fig.V Y1, or be formed within the body of the tube, by reamling the same out, as shown at 6, Fig. 3. The bores 4 and 5 communicate with cach other 1 represents arionf,l

by means of the inclined {ruste-conical surface 8.

Proecting from the rear portion 2 are tho brano es 9` and '10, said branches being provided-with connections 11 and 12 respecf tively, the former for gas and the latter for air under pressure.

The 'rear portion of the chamber is threaded interiorly for engagement by the exterior threaded portion 13 of Ya valve 14.

This valve is provided with a conical noesleVV 15 which controls and cuts off Vthe supply of gas into Vtlnebore 5. The valve 14 isfpro-V vided with two hores, the front bore 16 and the rearh bore Y172', a valve seat 18 being formed between said bores. Within the rear and larger bore is threaded the valve 19, the front end of which is considerably rcduced, eherebyV an annular space 2() is provided ,around the front of said valve, said space being opposite the connection 10. The exterior of the valve 14 is cut awa forming an annular chamber 21 into whic the connection 1) may disc argc, said chamber communicating Ywith t e space 2G by means of a suitable number of openings 22. The chamber 21 is of suliicient length to permit Y"the adiustrncnt of the valve 14 without the flow of air thereinto through the connection 10.

With the parts arranged and constructed .as above described, the operation'is as fol- Vl'ores;H(,la,s is supplied through the connection 9 into the' annular chamber 23 formed around ntheY front of the valve 14. iheneeitY passes, between the point of the Yvalve and the seat 15, in a thin converging sheet, into the bore 5.Y Air under pressure is supplied through the connection 10, chambei" 21, assages 22, space 2U, and bore 16 into the ore 5, serially thereof and centrally of the gas supplied thereto. The size ci the duct 16 permits sulilcient air to enter the mixing duct 5 te produce a blue llame, while the latter duct is of such diameter and length as to accommodate' andthoroughlyY intermingle the acteylene andY air i'itrodoeed thereinto. Entering the chamberV the mixtureexpands, being protected from the atmosphere by the hood 7. The mixture may nonr be ignited and will burn 'with a blue flame, but, when the air pressure is increased for Ythe purpose oi pointing the llame, the

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. sion of the hood 7 prevents this dying or blowing out of the flame and, by turning on the air pressure, a lo blue oxidizl flame is rov'ided which will not light ack witliin the duct 5 and which will remain permanent, extendi into the hood 7 and adhering closely to t e end of the duct 5. This adherence of the iiame to the end of the duct 5is secured by the use of the hood and, in the ease of small blowipes, the pointing of the flame as well as t e adherence thereof to the end of the duct 5 is augmented by the provision of several passages 24 extending through the hood 7, adjacent the poin't of connection of the tubular body 3 therewith, and preferably through the inclined surface 25 within said hooi In Fig. 3, these passages, designated as 24, extend through the inclined surface 235 formed by' the end of the tool by which the chamber 6 is reamed into the end of the blow pipe.

Owing to the size of the duct 16, a relatively large supply of air to the blow-pipe is secured. This not only admits enoughr air to obtain a proper lnixture of the same with the acetylene, but prevents lighting back by supplying the air under su flicient pressure to preventsuch action. It will be observed that the outlet of the duct 5 is unrestricted. I have found that this appears to be necessary in using air with an acetylene blow pipe, as obstructing the duct prevents the production of an effective flame.

The chambered hood provides means Y,

whereby the base of the flame is retained in proximity to the'end of the blow pipe. It is elieved that this result is due largely to the shielding of the base of the flame from the impingement thereagainst `of air currents.

` flame of the character produced by air and ordinary gas in other blfow pipes. This result has been attempted before, but so far as I am aware, without success, as, when air is supplied in sufficient quantity to obtain a blue fiame, the flame will be extinguished. Furthermore, there has always been a tendencv for the llame to "light back orexplode Within the burner body, resulting, when a mixer is employed in the as tank, in the propagation of the flame into such tank, causing the latter to explode. These defects are cured by my blow .pipe and the manner in which the gas and air are supplied thereto and mingled therein.

Where there is a diminution in the diameter of the mixing duct, such as is sometimes used to prevent lighting back," where oxygen is employed, as distinguished from air, lnsufiicient air can be admitted to the mixing duct to produce proper combustion of the acetylene. Where, in the claims, the term unobstructed or uncontracted is employed, I mean a duct free from obstructions or contractions of this kind. Moreover, the duct must be of sufficient length to permit thorough mixing of the acetylene and air to produce a blue flame. Bv the term "elongated, which is used in the claims in conlnection with this duct, I mean a d uct of suf` ficient length to accomplish this thorough mixing.

Having thus described my invention what I claim as new and desire to secure by Letters-Patent is 1. An acetylene blow ipe comprising a body having an elongate( mixing duct terminating in an enlarged outlet chamber, means for supplyingr acetylene to said duct, and `1neans for supplyin air under pressure to said duct, substantialy as specified.

2. An acetylene blow pipe comprising an elongated mixing duct terminating in an enlarged outlet chamber, means for supplying acetylene to the inlet end of said duct, means for sup )lying air under pressure to s aid duct, and va ves for controlling the supply of such fiuids to the duct, substantially as specified.

3. An acetylene blow pipe comprising an elongated unobstructed mixing duct terminating in an enlarged outlet chamber, and means for supplying acetylene and air to said duct, substantially as speciiied.

elongated unobstructed mixing duct terminating inan enlarged outlet chamber, means for supplyin acetylene and air to said duct, and means or admittin air to said chamber, substantially as speci ed.

5. An acetylene blow pipe comprising an elongated' mixing` duct terminating in an enlarged outlet chamber, means for supplying acetylene and air to said duct, one or more passage-ways for air being provided in said chamber at a point adjacent the junction of said duct and chamber, substantially as described.

. 6. An acetylene blow pipe comprising anelongated mixing duct terminating 1n an enlarged outlet chamber, means for supplying acetylene and air to said duct, one or more assage-ways being provided 1n said chamber for an additional supply of air, said passage ways being inclined toward the axls of said chamber, substantially as specified.

7. An acetylene blow plpe comprising an elongated mixing duct terminating in an enlarged outlet chamber, and means for supplyin air under pressure and acetylene to said uct, substantially as s ecified.

8l. The combination in a urner tube with an inner` air inlet tube, and an outer com minglin burner tube into which said air inlet tu e is adapted to discharge, of an enlarged integral tubular extremlty for said 4. An acetylene blow pipe comprising an IOO IIO

burner tube, end s shoulder connecting seid enlarged extremity and tube, end air inlet perforstions in the seid shouder.

9. A blowpipe for acetylene or similar gases rich in carbon comprising in combination a, mixing duet, means for supplying gas to said duct, means for supplyin air under pressure to said duct, and Ineens 1%)1 retaining in uxtepositien to the outlet end of the bowpipe the base of the eme produced by the ignition of the mixture of gas and air issuing from said duet, substantially as specified.

l0. A blowpi e for aoetyiene or similar gases rich in car on com rising in combinetion en eiongated mixing uct, means for suppl ying Lges to said duet, means for supplying air un er pressure to seid duet, va vos for controlling the ow of gas and sir to seid duet,. and Ineens for retaining in iuxte esition to the outlet'end of the blowpipe Vtine ese of the flame produced by the ignition of the mixture of es and air issuing from said duet, substantial y as specified.

11. A blowpi e for acetylene or similar gases rieb in Carbon comprising in combinetien en elongated, unobstructed mixing duct; means for supplying ges to said duct, means for su piying eir under pressure to seid duet, ang means for shieding the portion of the mixture adjacent to the outlet end of seid duct from im ingement by ourrents of sir entrained by t e iss Y mixture end iowing generail longtudine y of seid biowpipe, substantie i es speeied.

in testimony whereof aiix my signature in the presence of two Witnesses.

JOHN HARRIS. A Witnesses:

G. W. HOPKINS, B; W. BROCKETT. 

